DD is in early years and is a summer born, so only 4 still. She is doing brilliantly with phonics and can segment and blend words with no problem. But while she recognises some words (e.g. He, the, is, and, etc.) there are lots of words that she has seen many times but just can't remember (e.g. can, put). Is this a problem? She is currently on the pink band/Oxford Reading Tree 1+ at school, although she has some higher level books from the library that she can decode.